|Pleurothallis (syn. Acronia) cyanea|
|Pleurothallis (Acronia) calceolaris|
Now compare the dorsal sepals (in the 12 o'clock position) of the two species. The blood red flowers of P. calceolaris have a dorsal sepal that is tall and appears narrow because the margins are reflexed backwards. I like the pebbly (verrucose) texture.